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        console.log(3 >= 5); //false
        console.log(3 <= 5); //true
        //1. 程序里面的等于符号为 == 默认转换数据类型 会把字符串型的数据转换为数字型 只要求值相等就可以
        console.log(3 == 5); //false 
        console.log('pink' == 'blue'); //false
        console.log(18 == 18); //true
        console.log(18 == '18'); //true
        console.log(18 != 18); //false
        //2.程序里面有全等 一模一样 要求两侧的值还有数据类型完全一致
        console.log(18 === 18); //true
        console.log(18 === '18'); //false
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